Rotational position detector device for rotary actuator

Abstract

A rotational position detector device (20), which is fastenable to a rotary actuator (1) of the type comprising a rotary motor (3,5) inside a housing (2) and a rotary shaft extending therefrom, a turning element (21) adapted to be rotationally fastened to the rotary shaft, said turning element being detectable by at least one position sensor (23), which is adapted to be adjustably fixed with respect to the housing (2). The device is provided with a socket portion (25) which is rigidly connected to the housing and coaxial with said shaft and at least one sensor holder (24) which is rotatably attached to said socket portion and adjustably fixable in chosen angular positions by means of locking cooperation between a resilient engagement means (26,27) on the sensor holder and a surface (30) which is provided with engagement irregularities.

I claim: 
     
       1. Rotational position detector device (20), which is fastenable to a rotary actuator (1) of the type comprising a rotary motor (3,5) inside a housing (2) and a rotary shaft extending therefrom, a turning element (21) adapted to be rotationally fastened to the rotary shaft, said turning element being detectable by at least one position sensor (23), which is adapted to be adjustably fixed with respect to the housing (2), characterized in a socket portion (25) which is rigidly connected to the housing and coaxial with said shaft,   at least one sensor holder (24) which is rotatably attached to said socket portion and adjustably fixable in chosen angular positions by means of locking cooperation between a resilient engagement means (26,27) on the sensor holder and a surface (30) which is provided with engagement irregularities.   
     
     
       2. Device according to claim 1, characterized in that said surface (30) has a general extension perpendicular to the axis of said socket portion (25). 
     
     
       3. Device according to claim 2, characterized in that the sensor holder (24) consists of a ring-shaped ring portion (28) surrounding the periphery of the socket portion and a sensor engagement portion (29). 
     
     
       4. Device according to claim 3, characterized in that the sensor engagement portion (29) inwardly is provided with projections for holding cooperation with a sensor and outwardly with said engagement means (26, 27) . 
     
     
       5. Device according to claim 4, characterized in that the sensor engagement portion (29) comprises engagement means (26,29) which are directed in different axial directions to allow turnability. 
     
     
       6. Device according to claim 5, characterized in that the ring portion (28) is axially displaced with respect to the sensor engagement portion (29), thereby allowing placement of two different sensor holders (24) differently turned and directed on essentially the same axial space. 
     
     
       7. Device according to claim 3, characterized in that the sensor engagement portion (29) as seen in a direction perpendicular to its extension from the ring portion and in parallel with the main plane thereof, approximately comprises the form of a U. 
     
     
       8. Device according to claim 7, characterized in that the essentially parallel parts of the sensor engagement portion (29) (as seen from one side), forming the U-shape, lack overlap as seen in a direction parallel with the axis of the ring portions. 
     
     
       9. Device according to claim 1, characterized in that said surface (30) extends annularly around the socket portion (25). 
     
     
       10. Device according to claim 1, characterized in that the surface (30) is provided with tooth-like engagement irregularities. 
     
     
       11. Device according to claim 1, characterized in that the turning element (21) is comprised of an arm in order to limit the rotary angle.